4 DIAGNÓSTICO OBTENIDO
4.1 DIAGNÓSTICO OBTENIDO EN EL ANÁLISIS DE LOS PROGRAMAS, POBLACION
A hypothetical adsorbent, which is silica gel particle coated with a thin film of 4A zeolite, was proposed and tested by simulating the PSA process. The isotherm of the hypothetical adsorbent was predicted from the silica gel experimental data and the mass transfer coefficients relations of 4A zeolite were used in the simulation. PSA simulations were done under different operating conditions, such as operating temperature, CoD end pressure and feed flow rate. Both hypothetical adsorbent and 4A zeolite was used in the simulations to compare the performance. The results showed that better PSA performance could be obtained with the hypothetical adsorbent. Also, because of the bigger working capacity of the hypothetical adsorbent than 4A zeolite, a smaller operating pressure ratio was used in the simulations compared to the ones in Chapter 4. Thus less compression cost was required. The PSA processes with the best performance were chosen to connect with a distillation column to build a hybrid system, and the distillation processes were simulated with different feed flow rate ratios to PSA and distillation. Two cases with 4A
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zeolite as the adsorbent were also simulated to compare with the hypothetical adsorbent cases. The costs in the partial condenser, reboiler of distillation and compressors were calculated for all the hybrid systems with the selected PSA processes. The total operating cost was compared with the reference which is the commercial distillation and the results showed that this hypothetical adsorbent appears to do the job that commercial silica gel, 4A zeolite, 13X zeolite and carbon molecular sieve could not do. When combined with an efficient PSA cycle, this hypothetical adsorbent can be used in a PSA-distillation process to reduce energy costs by about 10%.
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